Calendar



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GAL'ENDARV No. 375,736. Patented Jan. 3. 1888 W IINESSESZ I VEN'IQR flifiomey. 7

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CALENDAR.

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(No Model.) 8 Sheets-Sheet s. W. K. DAVID.

CALENDAR.

No. 375,736. Patented Jan. '3, 1888.

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(No'ModeL) 8 SheetsSheet 4.

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CALENDAR. No. 375,736. Patented Jan. 3, 1888.

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(No Model.) 8 Sheets-Sheet 5.

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CALENDAR.

- No. 375,736. Patented Jan. 3, 1888.

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(No Model.) s SheetsSheet s. W.'K. DAVID.

CALENDAR.

Patented Jan. 3, 1888.

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(No Model.)

8 Sheets-Sheet 7.

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CALENDAR.

Patented Jan. 3, 1888.

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(No Model.) 8 Sheets-Sheet 8.

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CALENDAR.

No. 375,736. Patented Jan. 3,1888.

W ITNESSESI INVEN'IOR N. PETERS. PnnmLmw n mr. wam'm mn. 04C.

UNITED STATES PATENT OFFICE.

WVILLIAM K. DAVID, OF CHICAGO, ILLINOIS.

CALENDAR.

SPECIFICATION forming part; of Letters Patent No. 375,736, dated January 3, 1888.

Application filed June 25, 1886. Serial No. 206,207. (No model.)

To all whom it may concern:

Be it known that 1, WILLIAM K. DAVID, of Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Calendars, which improvement is fully set forth in the following specification and accompanying drawings, in which- Figure 1 is an obverse View of myimprovcd calendar. Fig. 2 is a reverse view; Fig. 3, a vertical central section; Fig. 4, a view of the card or chart with the disks removed, exposing the segmental incision. Fig. 5 is a View of the outer disk detached; Fig. 6,a face view of the inner disk detached; Fig. 7, a reverse View of the inner disk; Fig. 8, a face view of a modification of my device; and Fig. 9, a re verse view of the modification.

My invention has reference to an improvement in the class of devices known as uni versal calendars, the principal part of which consists in a chart or card having a segmental slot cut therein to expose the edges of rotatable disks pivoted on the obverse face of the card. The outer and larger disk is provided with the number of years in a century from 0 to 99, arranged spirally thereon in series of four each within radial spaces, having blank spaces between 'the series of years. The obverse side of this disk has its periphery provided with the names of the days of the week with the numbers of the days of the month disposed beneath on the obverse face of the card in a series of seven radial spaces. The inner disk has the'centurial year in both old and new styles running from 0 to 2300 inclusive,so disposed as to be observed through perforations near the outer edge of the outer disk, and arranged so as to be used in conjunction with the number of years of any given century from 0 to 99, arranged spirally on the said disk, the obverse face of the inner disk having the names of the months with number of days, &c., disposed above the names of the days of the week on the outer chart, so that in adjusting the two disks in a particular manner on the reverse face of the card any desired date may be shown on the obverse side of the calendanthe entire device being so arranged that leap-year may be calculated as accurately as any other year, all of which will now be fully set forth.

In the accompanying drawings, A represents a card or chart which, as shownin Fig. 4, has a central pivotal point,B,and immediately beneath, but concentric therewith, a segmental incision, 0, having radial incisions D at the ends. Gent-rally I provide a recess, E, immediately over the incision G, for the purpose hereinafter to be described. Rotating on the pivotal point B, on the reverse face of this card, I provide a disk, F, as shown in Fig.5,

having radial lines G thereon extending from a concentric circle, H, near the center to the periphery. Between them and near their outer ends I provide a series of perforations or openings, I, and between these openings I and the circle I-I,I dispose the years of a century arranged from 0 to 99 somewhat in a spiral form, increasing from left to right around the said disk. The rim of the obverse face of this disk F, as shown in Fig. 1, at J, has the names of the days of the week thereon, arranged preferably in four consecutive series.

Immediately beneath the outer disk, F, I provide an inner or under disk, as shown at K in Fig. 6. This disk is somewhat smaller than the disk F, and in lieu of the radial lines, as

shown at G in Fig. 5, 1 provide radial peripheral divisions L, to correspond with the openings I of the disk F. These divisions L have the'centurial years in both the old and new style, running from 0 to 1500 old style,

inclusive, and from 1500 to 2300 new style, inclusive, thereon, and are arranged in a particular though not consecutive order,the leapyears being indicated by small arrows incorporated within a division over the year. The obverse face of this inner card, K, is also pro vided with short radial divisions near the pe riphery and having therein the names of the months and the number of days in the said month. These two disks F and K are rotatable independently of each other, so that any year of a century shown on-the disk F may be adjusted to any centurial year, as shown on the disk K,and after being thus adjusted to each other they work in unison throughout a given year. The two disks are then turned until any given months are shown through the aperture E on the obverse side of the calendar, the numerical dates of the month being shown in the quadrantal space M beneath the two disks and the corresponding as desired, suitable instruction may be placed.

The obverse face of the card is so disposed that the upper part may be entirely reserved for advertising, while the lower part of the card beneath the segmental incision O has a quadrantal space, M, as shown in Fig. 1, having seven divisions by means of short radial lines N. These seven divisions have the number of the days of the month incorporated therein. Thus the divisions of these quadrantal spaces correspond with the days of the week arranged on the obverse side of the disk F, as well as the names of the months on the obverse face of the card K.

My device thus far described refers to a universal'calendar, and with but slight modification I adapt it for use for any special year or any century. A slight modification, however, is necessary in order to arrange it for this purpose.

The card A has the segmental incision O, radial incisions D, and the opening E, as already described, and in lieu of the double disks F and K, I provide a single disk, 0, with the radial divisions corresponding with the disks F and K, and outwardly therefrom on the reverse face of the card A radial divisions with the names of the month incorporated therein. \Vithin the radial divisions of the reverse face of this disk 0, I incorporate the years of any particular century-as, for instance, the nineteenth century-commencing with the year 1800, extending to 1900, the said numbers of years arranged in spiral 'form, increasing from left to right. Thus by simply rotating the card the month of any year may be brought opposite any desired year of the century.

The obverse side of the card is arranged for a particular year of the centuryas, for instance, 1887. The months of this year are incorporated within the divisions P, as shown in Fig. 9, corresponding with. the divisions L of the disk K, as shown in Fig. 6, andthe names of the days of the week, as shown on the obverse side of the card, are incorporated immediately outwardly on the periphery of the back of this said disk 0, so that the disk 0 acts in the same capacity as the two disks F and K, with the names of the different months in a single year, as already shown, and the days of the week act in connection with the number of days of the month within the quadrantal space M on the obverse face of the card.

Advertising or other matter is designed to be placed within the spaces P on the obverse side of the disk K.

My device operates as follows: The disk F, containing the centurial years from 0 to 99, is rotated over the inner or under disk, K, un-

til the centurial year, either old or new style, as desired, is shown through the corresponding aperture I of the outer disk, F. Thetwo disks F and K may then be operated in unison for all the dates in a given year. The calendar is then reversed, and the two disks work v in unison and may be turned to any desired month until it shows through the aperture E, and the day of the week desired is shown immediatelybeneath the month, whilethe number of the day of the month desired is shown im mediately beneath in the quadrantal space M.

Having described my invention, what I claim as new is l. A chart having a graduated space containing the numerals of the days of the months and having segmental and radial incisions and recesses concentric with a central pivotal point, in combination with the two rotatable disks, the outer one having on one side figures indicating the number of years in a century, from O to 99, arranged spirally thereon within radial divisions, and on the other side the days of the week, and the inner disk having one side the centurial year,while the opposite side has the name of the months thereon to act in oonj unction with the number of the days of the month in the quadrantal space, substantially as set forth.

2. In a calendar, the combination of two r0 tatable disks, the one having on "its face the years of a century, from 0 to 99, also near its periphery segmental incisions and on the obverse side the name of the days of the week, the other disk having on its face around the periphery the centurial years, from 0 to 2300, and on the reverse side around the pe riphery the months and their days, whereby the centurial years will be seen through said segmental incisions, and the names of the weekdays will act in unison with thedays of the month, substantially as described.

3. In a calendar, the combination of the disk F, having radial divisions provided outwardly with apertures I, and inwardly with figures indicating the years of the century, from O to .99,incorporated therein in spiral form, increas ing from left to right, with an inner disk, K, having the radial peripheral divisions L,provided with figures indicating the centurial years, in both the old and new style, incorporated therein, the two disks being so disposed as to be operated independently of each other, substantially as herein set forth.

4.. In a calendar, the combination of the disk F, having radial divisions provided outwardly with apertures I, and inwardly with figures indicating the years of the century, from 0 to 99, incorporated therein in spiral form, increasing from left to right, an inner disk, K, having the radial peripheral divisions L, provided with the figures indicating the centurial years, in both the old and new styles, incorporated therein, the two disks being so disposed as to be operated independently of each other with the card or chart A, substantially as herein set forth.

5. The combination of the disk F, having obversely the names of the days of the week peripherally disposed in series, and the inner disk, K, having the names of the different months of the year incorporated within radial divisions ofthe periphery, the two disks be-.

the century on one side and the names of the days of the Week peripherally disposed on the opposite face, with the inner disk, K, having the centurial years, both old and new style, incorporated in divisions on the periphery of one side, while the names of the months and 20 the year are incorporated within radial divisions on the other, substantially as herein set forth.

In testimony that I claim the foregoing I have hereunto set my hand, this 4th day of 25 May, 1886, in the presence of witnesses.

WM. K. DAVID. Witnesses:

J. O. RoBIsoN, J r., O. D. ZERBE. 

